# SDR UALA2013061704161

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 14, 2013
- Submitted: July 12, 2013
- Operation: Air carrier
- Aircraft: [N652UA](https://openairdocs.org/aircraft/N652UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 25390
- Aircraft time: 90,385 hours, 14,336 cycles
- Engine: Pwa PW4060
- System (JASC): [2133 · Pressure Regulator/Outflow Valve](https://openairdocs.org/jasc/2133)
- Part: Outflow Valve
- Part number: 60683221U1
- Part serial: 3
- Condition: Malfunctioned
- Location: Cabin Pressure
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2013061704161

## Discrepancy

RECEIVED A CABIN ALTITUDE WARNING IN AUTO 1 - CABIN ALTITUDE REACHED 10,000 FT, MANUAL CONTROL AND AUTO 1 OK, NOW CONTROL OK AND AUTO 1 OK.   NOW SHOWING GRADUAL CLIMB IN AUTO 1 EVEN THOUGH DIFFERENTIAL PRESSURE IS LESS THAN 8 PSI.  CREW SELECTED MANUAL AND RECOVERED CABIN PSI.  ACCOMPLISHED LM CALLOUTS ON PTT SEQ 3852009, 3852008 AND 3852001, OPS CHECKED GOOD.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.